Saturday Night Live's Jason Sudeikis is not the father of January Jones baby, E! reports.

According to a source, the father is someone Jones met on set while filming X-Men: First Class. The timeline makes sense; filming began in January, and Jones announced her pregnancy in late April. She is now starting to show.

No word on whether Jones was involved with a cast member or someone behind the scenes, but her male co-stars in the movie include James McAvoy, Kevin Bacon, Michael Fassbender, Nicholas Hoult and Jason Flemyng.

Sudeikis was tongue-tied over Jones' pregnancy at the White House Correspondents' Dinner in early May; he and Jones broke up in January (they started dating in July 2010). When asked if he wanted to comment he said, "I’d rather ... yes but no," fueling speculation that he was the baby daddy.

Saturday Night Live's Jason Sudeikis got tongue-tied at the White House Correspondents' Dinner Saturday night when pressed about ex January Jones' pregnancy announcement.

Mad Men's Jones, who last week announced that she is pregnant with her first child, has not named the father of her baby. She and Sudeikis dated from July 2010 to January of this year, putting him in the possible papa zone.

When asked if he wanted to comment, the funnyman replied with pause:

“I’d rather ... yes but no.”

And when questioned on whether he was surprised to find out about her pregnancy, he "stammered," the Washington Post reporter says.

“No, I ... no, I didn’t have anything [else to say].”

Sudeikis would speak about one thing; his upcoming MTV Movie Awards hosting gig. See what he had to say after the jump.